We present a multi–messenger measurement of the Hubble constant H0 using the binary–black–hole merger GW170814 as a standard siren, combined with a photometric redshift catalog from the Dark Energy Survey (DES). The luminosity distance is obtained from the gravitational wave signal detected by the LIGO/Virgo Collaboration (LVC) on 2017 August 14, and the redshift information is provided by the DES Year 3 data. Black–hole mergers such as GW170814 are expected to lack bright electromagnetic emission to uniquely identify their host galaxies and build an object–by–object Hubble diagram. However, they are suitable for a statistical measurement, provided that a galaxy catalog of adequate depth and redshift completion is available. Here we present the first Hubble parameter measurement using a black–hole merger. Our analysis results in H0 = 75+−4032 km s−1 Mpc−1, which is consistent with both SN Ia and CMB measurements of the Hubble constant. The quoted 68% credible region comprises 60% of the uniform prior range [20,140] km s−1 Mpc−1, and it depends on the assumed prior range. If we take a broader prior of [10,220] km s−1 Mpc−1, we find H0 = 78+−9624 km s−1 Mpc−1 (57% of the prior range). Although a weak constraint on the Hubble constant from a single event is expected using the dark siren method, a multifold increase in the LVC event rate is anticipated in the coming years and combinations of many sirens will lead to improved constraints on H0.
|Original language||English (US)|
|State||Published - Jan 6 2019|
- Catalogs — cosmology: observations
- Gravitational waves
ASJC Scopus subject areas